<html xmlns="http://www.w3.org/1999/xhtml">
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=507487
-->
<body>
<div style="display:block; width:100px; height:100px; background: blue;"></div>
<div style="display:block; width:100px; height:100px; background: green;"></div>
<div style="display:block; width:100px; height:100px; background: blue;"></div>
<div style="display:block; width:100px; height:100px; background: green;"></div>
</body>
</html>
